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      1 /* $NetBSD: psci.c,v 1.8 2024/12/30 19:09:49 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.8 2024/12/30 19:09:49 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/cpu.h>
     35 #include <sys/device.h>
     36 
     37 #include <arm/arm/psci.h>
     38 
     39 /* PSCI methods */
     40 #define	PSCI_VERSION		0x84000000
     41 #define	PSCI_SYSTEM_OFF		0x84000008
     42 #define	PSCI_SYSTEM_RESET	0x84000009
     43 #if defined(__aarch64__)
     44 #define	PSCI_CPU_SUSPEND	0xc4000001
     45 #define	PSCI_CPU_ON		0xc4000003
     46 #else
     47 #define	PSCI_CPU_SUSPEND	0x84000001
     48 #define	PSCI_CPU_ON		0x84000003
     49 #endif
     50 #define	PSCI_FEATURES		0x8400000a
     51 
     52 static psci_fn psci_call_fn;
     53 
     54 static uint32_t psci_functions[PSCI_FUNC_MAX] = {
     55         [PSCI_FUNC_VERSION] = PSCI_VERSION,
     56         [PSCI_FUNC_SYSTEM_OFF] = PSCI_SYSTEM_OFF,
     57 	[PSCI_FUNC_SYSTEM_RESET] = PSCI_SYSTEM_RESET,
     58 	[PSCI_FUNC_CPU_SUSPEND] = PSCI_CPU_SUSPEND,
     59 	[PSCI_FUNC_CPU_ON] = PSCI_CPU_ON,
     60 	[PSCI_FUNC_FEATURES] = PSCI_FEATURES,
     61 };
     62 
     63 int
     64 psci_call(register_t fid, register_t arg1, register_t arg2, register_t arg3)
     65 {
     66 	KASSERT(psci_call_fn != NULL);
     67 
     68 	if (fid == 0)
     69 		return PSCI_NOT_SUPPORTED;
     70 
     71 	return psci_call_fn(fid, arg1, arg2, arg3);
     72 }
     73 
     74 enum psci_conduit
     75 psci_conduit(void)
     76 {
     77 	if (psci_call_fn == psci_call_smc) {
     78 		return PSCI_CONDUIT_SMC;
     79 	} else if (psci_call_fn == psci_call_hvc) {
     80 		return PSCI_CONDUIT_HVC;
     81 	} else {
     82 		return PSCI_CONDUIT_NONE;
     83 	}
     84 }
     85 
     86 uint32_t
     87 psci_version(void)
     88 {
     89 	if (psci_functions[PSCI_FUNC_VERSION] == 0) {
     90 		/* Pre-0.2 implementation */
     91 		return __SHIFTIN(0, PSCI_VERSION_MAJOR) |
     92 		       __SHIFTIN(1, PSCI_VERSION_MINOR);
     93 	}
     94 
     95 	return psci_call(psci_functions[PSCI_FUNC_VERSION], 0, 0, 0);
     96 }
     97 
     98 int
     99 psci_cpu_on(register_t target_cpu, register_t entry_point_address,
    100     register_t context_id)
    101 {
    102 	return psci_call(psci_functions[PSCI_FUNC_CPU_ON], target_cpu,
    103 	    entry_point_address, context_id);
    104 }
    105 
    106 int
    107 psci_cpu_suspend(uint32_t power_state)
    108 {
    109 	return psci_call(psci_functions[PSCI_FUNC_CPU_SUSPEND], power_state,
    110 	    0, 0);
    111 }
    112 
    113 void
    114 psci_system_off(void)
    115 {
    116 	psci_call(psci_functions[PSCI_FUNC_SYSTEM_OFF], 0, 0, 0);
    117 }
    118 
    119 void
    120 psci_system_reset(void)
    121 {
    122 	psci_call(psci_functions[PSCI_FUNC_SYSTEM_RESET], 0, 0, 0);
    123 }
    124 
    125 int
    126 psci_features(uint32_t fid)
    127 {
    128 	if (psci_functions[PSCI_FUNC_FEATURES] == 0) {
    129 		return PSCI_NOT_SUPPORTED;
    130 	}
    131 	return psci_call(psci_functions[PSCI_FUNC_FEATURES], fid, 0, 0);
    132 }
    133 
    134 void
    135 psci_init(psci_fn fn)
    136 {
    137 	psci_call_fn = fn;
    138 }
    139 
    140 bool
    141 psci_available(void)
    142 {
    143 	return psci_call_fn != NULL;
    144 }
    145 
    146 void
    147 psci_clearfunc(void)
    148 {
    149 	for (int i = 0; i < PSCI_FUNC_MAX; i++)
    150 		psci_setfunc(i, 0);
    151 }
    152 
    153 void
    154 psci_setfunc(enum psci_function func, uint32_t fid)
    155 {
    156 	psci_functions[func] = fid;
    157 }
    158